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Spectral characteristics of plant communities from salt marshes:A case study from Chongming Dongtan,Yangtze estuary,China

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Frontiers of Environmental Science & Engineering 2008年第2期2卷 187-197页

作者： Liquan ZHANG Zhanguo GAO Richard ARMITAGE Martin KENT State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China Environment Monitoring Center of Ningbo Ningbo 315012China Research Institute for the Built and Human Environment School of Environment and Life ScienceUniversity of SalfordSalford M54WTUK School of Geography University of PlymouthPlymouth PL48AAUK

The spectral reflectance of recently formed salt marshes at the mouth of the Yangtze River,which are undergoing invasion by Spartina alterniflora,were assessed to determine the potential utility of remotely sensed data in assessing future invasion and changes in species *** a review of published research on remote sensing of salt marshes,53 locations along three transects were sampled for paired data on plant species composition and spectral reflectance using a FieldSpecTM Pro JR Field Portable *** data were processed concerning reflectance,and the averaged reflectance values for each sample were reanalysed to correspond to a 12-waveband bandset of the Compact Airborne Spectral *** spectral data were summarised using principal components analysis(PCA)and the relationships between the vegetation composition,and the PCA axes of spectral data were *** first PCA axis of the reflectance data showed a strong correlation with variability in near infrared reflectance and‘brightness’,while the second axis was correlated with visible reflectance and‘greenness’.Total vegetation cover,vegetation height,and mudflat cover were all significantly related to the first *** implications of this in terms of the ability of remote sensing to distinguish the various salt marsh species and in particular the invasive species *** were *** differences in species with various physiognomies could be recognised but problems occurred in separating early colonising *** from other species at that *** work using multi-seasonal hyperspectral data might assist in solving these problems.

关键词： Chongming Dongtan of China salt marsh vegetation spectroradiometer compact airborne spectral imager(CASI) canopy reflectance indirect ordination

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